Study on polyvinylidene fluoride/matrix⁃like groups⁃modified graphene composites with high thermal conductivity

doi:10.19491/j.issn.1001-9278.2022.02.007

Abstract

Abstract:

Graphene oxide was modified with vinyl trimethoxysilane containing matrix?like groups， and then functionalized graphene （F?GE） was reduced through a one?pan method. The thermal conductive polyvinylidene fluoride （PVDF）/F?GE composites with excellent interface properties were prepared using a solvent?casting method. The modified state， microstructure， thermal conductivity， and mechanical properties of the obtained composites were investigated using infrared spectrometer， scanning electron microscope， thermal conductivity tester， and electronic tensile testing machine. The results indicated that the dispersibility of the F?GE was enhanced greatly， and its compatibility with the PVDF matrix was improved significantly. The thermal stability， tensile strength， and thermal conductivity of the composites were significantly increased. When the content of F?GE was 20 %， the composite achieved a thermal conductivity 2.08 W/（m·K）， which was 845 % higher than that of pure PVDF ［0.22 W/（m·K）］. However， the PVDF/GE composite only showed an increase in thermal conductivity by 409 %. Meanwhile， the composites maintained good mechanical properties and thermal stability， and their tensile strength reached 112.6 MPa. The composites also exhibited a melting point of 171.3 ℃ and a thermal decomposition temperature of 471 ℃， which were higher than pure PVDF by 5.5 ℃ and 7 ℃， respectively.

Key words: graphene, polyvinylidene fluoride, thermal conductivity, mechanical property, composite material

CLC Number:

TQ325.1⁺2

HE Mingfeng, WANG Ke, WANG Qiyang, YANG Xiao, GUO Hong, HU Boyang, LI Baoan. Study on polyvinylidene fluoride/matrix⁃like groups⁃modified graphene composites with high thermal conductivity[J]. China Plastics, 2022, 36(2): 41-48.

Figures/Tables 11

Fig.1. Preparation process of F?GE

Fig.2. FTIR spectra of GO and F?GE

Fig.3. Raman spectra of GE， GO and F?GE

Fig.4. Decentralized state of GE and F?GE

Fig.5. SEM images of the composites

Fig.6. TG curves of the samples

Fig.7. Thermal stability of PVDF/F?GE with different F?GE content

填充材料	填料含量/%	T₅/℃	T₃₀/℃	T/℃
—	—	443.2	476.5	227.0
F⁃GE	1	446.0	486.1	230.3
GE	10	408.8	471.7	218.8
F⁃GE	10	451.1	489.4	232.3
F⁃GE	20	455.3	500.9	236.5

Tab.1. Heat resistance index of PVDF composites

Fig.8. Tensile strength of PVDF composites

Fig.9. Tensile strength enhancement rate of PVDF composites

Fig.10. Thermal conductivity of PVDF composites

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